Sample case study from HBRAmp Up, a wildly popular electronic-music game, is the brainchild of KMS's cherished programmers, who now spend their time trying to keep customers dazzled with upgrades. But a couple of start-ups have ripped off the idea using their own code -- which is open source. Now they're demanding that KMS float with the rising tide and join the open-source community. How could the company make money without its IP? And why should it try? Four experts comment on this fictional case study.